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Texas Instruments SN74CBTLV3125D
- Part No.:
- SN74CBTLV3125D
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74CBTLV3125D.pdf
- Description:
- IC BUS SWITCH 1 X 1:1 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
SN74CBTLV3125D from Texas Instruments is a low-voltage quadruple FET bus switch with independent 5Ω analog switches, rail-to-rail signal handling (0–3.6 V), and Ioff partial-power-down protection. It operates across –40°C to +85°C and is used for protocol isolation (JTAG/SPI/GPIO) in datacenter computing, wired networking, and motor drive control subsystems.
For engineers reviewing the SN74CBTLV3125D datasheet, SN74CBTLV3125D pinout, SN74CBTLV3125D application, or SN74CBTLV3125D equivalent, key selection criteria include on-resistance (5–8 Ω), propagation delay (0.15–0.25 ns), Ioff leakage (<10 µA at VCC = 0), thermal resistance (123 °C/W in SOIC), and OE-controlled high-impedance state during power sequencing.
Technical Context
The SN74CBTLV3125D implements four independent bidirectional FET switches, each controlled by a dedicated active-high output-enable (OE) input. Its CMOS-based transmission gate architecture enables rail-to-rail analog/digital signal switching without level translation.
Each switch exhibits low on-state resistance (5–8 Ω typical at VCC = 3.3 V, II = 64 mA), sub-nanosecond propagation delay, and guaranteed isolation when powered down via Ioff - preventing backflow current even with up to 3.6 V applied at I/O ports while VCC = 0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (ron) | 5–8 Ω typical at VCC = 3.3 V, 64 mA - ensures minimal voltage drop and signal attenuation in high-speed digital or analog signal paths. |
| Propagation delay (tpd) | 0.15 ns (VCC = 2.5 V), 0.25 ns (VCC = 3.3 V) - supports >1 GHz signal integrity for PCIe, USB, or memory bus isolation. |
| Ioff leakage | <10 µA at VCC = 0, VI/VO = 0–3.6 V - enables safe hot-swap and live-insertion without power sequencing constraints. |
| Supply voltage range | 2.3–3.6 V - compatible with 2.5 V and 3.3 V logic domains; not rated for 1.8 V operation. |
| Operating temperature | –40°C to +85°C - qualified for industrial and enterprise-grade embedded systems, excluding extended-temp variants. |
| ESD rating (HBM) | ±2000 V - meets JEDEC JS-001 Class 2, supporting robust handling in automated assembly and field-replaceable modules. |
| Junction-to-ambient (RθJA) | 123 °C/W (SOIC-14 package) - defines maximum power dissipation (≈32 mW at 50°C ambient) before thermal derating applies. |
Pinout & Package
SN74CBTLV3125D is packaged in a 14-pin SOIC (D) with nominal body size 8.65 mm × 3.91 mm and standard 1.27 mm pitch. Pin 1 is marked with a beveled corner or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-high enable input | Controls corresponding switch pair; high = open circuit (high-Z), low = closed path between A/B terminals. |
| 1A, 2A, 3A, 4A | Bidirectional I/O port A | One side of each FET switch; connects directly to source/load without directionality or buffering. |
| 1B, 2B, 3B, 4B | Bidirectional I/O port B | Other side of each FET switch; electrically identical to A terminal; no internal polarity or driver asymmetry. |
| VCC | Positive supply | Power rail for switch biasing and internal logic; must be decoupled with 0.1 µF capacitor placed adjacent to pin. |
| GND | Ground reference | Return path for all switch currents and internal logic; requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail switching | Supports full 0–3.6 V signal swing on both A and B ports - preserves logic high/low margins across mixed-voltage interfaces. |
| Ioff partial-power-down | Blocks backflow current when VCC = 0, enabling safe isolation of unpowered subsystems during hot-swap or fault recovery. |
| 5 Ω on-resistance | Minimizes insertion loss and timing skew in high-speed parallel buses (e.g., address/data lines, JTAG TDI/TDO). |
| Sub-nanosecond tpd | Enables transparent switching in >1 Gbps serial links or multi-GHz clock distribution paths without added jitter. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II - ensures robustness against transient overvoltage events in noisy industrial environments. |
Applications
| Protocol Isolation | Hot-Swap Backplane Interface |
|---|---|
|
Use Scenario: Isolating JTAG debug, SPI configuration, or GPIO control signals between a main processor and peripheral modules in modular server blades. IC Role / Device Role / Timing Role: Bidirectional signal gate enabling/disabling physical layer connectivity without interrupting host CPU operation. Use Value: Eliminates need for complex power sequencing; allows firmware-initiated module reset or reconfiguration while system remains powered. |
Use Scenario: Enabling live insertion/removal of line cards in telecom or enterprise switching chassis with uninterrupted backplane communication. IC Role / Device Role / Timing Role: Signal-level isolation switch placed between backplane traces and card-edge connectors. Use Value: Prevents bus contention and voltage backfeed during card insertion; maintains signal integrity under dynamic load conditions. |
| Motor Drive I/O Multiplexing | Industrial Sensor Hub Interfacing |
|
Use Scenario: Sharing a single microcontroller's GPIO or UART interface among multiple motor drivers (e.g., stepper, BLDC) in compact motion-control systems. IC Role / Device Role / Timing Role: Low-latency analog/digital multiplexer routing control signals to selected drive ICs on demand. Use Value: Reduces MCU pin count and PCB layer count; avoids software-based bit-banging delays with hardware-switched signal paths. |
Use Scenario: Aggregating analog and digital sensor outputs (temperature, pressure, proximity) into a centralized industrial controller via shared bus segments. IC Role / Device Role / Timing Role: High-impedance isolation barrier preventing cross-talk and ground loop interference between sensor channels. Use Value: Maintains measurement accuracy in noisy factory environments; supports simultaneous sampling without channel crosstalk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bus switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74CBTLV3245D | Octal (8-channel), 3-state output with separate OE; higher pin count (24-pin SOIC); 6 Ω ron. | Used where wider data bus isolation is required (e.g., 8-bit parallel interfaces), not direct replacement for quad-channel layout. | Select SN74CBTLV3245D only when expanding channel count beyond four; requires PCB redesign due to different pinout and package size. |
| TS3A24159DGSR | Quad SPDT analog switch; 0.7 Ω ron; 3.6 V max; supports 1.8 V logic control; 10-pin VSSOP. | Preferred for ultra-low-loss analog signal routing (e.g., audio, sensor front-end), but lacks Ioff and rail-to-rail digital compatibility. | Choose TS3A24159DGSR for analog-dominant paths requiring <1 Ω resistance; avoid for digital bus isolation where Ioff and 3.3 V compatibility are mandatory. |
Compared with SN74CBTLV3245D and TS3A24159DGSR, the SN74CBTLV3125D uniquely balances low on-resistance, guaranteed Ioff, and rail-to-rail digital signal support in a compact 14-pin SOIC - making it optimal for cost-sensitive, space-constrained digital isolation where partial-power-down safety is non-negotiable.
Availability
SN74CBTLV3125D is available at Aetrix Electronics and suitable for datacenter computing, wired networking, and motor drive applications requiring stable component supply, long-term industrial lifecycle support, and verified traceable sourcing.
Supply support for SN74CBTLV3125D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74CBTLV3125D belongs to TI's CBTLV (ColdFire Bus Transceiver Low-Voltage) logic family, designed specifically for high-speed, low-power signal routing and isolation in enterprise infrastructure and real-time control systems.
FAQ
What is the maximum operating voltage for SN74CBTLV3125D?
The SN74CBTLV3125D supports a supply voltage range of 2.3 V to 3.6 V. Input and I/O voltages may swing from –0.5 V to 4.6 V absolute maximum, but functional operation is guaranteed only within 0–3.6 V when VCC is powered. Exceeding 3.6 V on any pin risks permanent damage.
Does SN74CBTLV3125D support 1.8 V logic control inputs?
No. SN74CBTLV3125D does not guarantee reliable operation with 1.8 V control inputs. Its VIH minimum is 1.7 V at VCC = 2.3–2.7 V and 2.0 V at VCC = 2.7–3.6 V. For true 1.8 V-compatible OE control, consider TI's TS3A series or other logic-level-shifted alternatives.
Can SN74CBTLV3125D be used to isolate analog sensor signals?
Yes - the SN74CBTLV3125D supports rail-to-rail analog signal switching (0–3.6 V) with low on-resistance (5–8 Ω) and minimal charge injection. However, it lacks guaranteed analog performance specs (e.g., THD, bandwidth) and is optimized for digital bus isolation; for precision analog paths, TI's TS5A series is preferred.
Is SN74CBTLV3125D pin-compatible with SN74CBTLV3126D?
No. SN74CBTLV3125D has four independent switches (1A/1B through 4A/4B) with four OE pins, while SN74CBTLV3126D is a dual 2-bit bus switch with different pin mapping (e.g., shared OE). Their pinouts differ fundamentally; PCB layout and firmware initialization must be redesigned for substitution.
What is the thermal resistance (RθJA) of SN74CBTLV3125D in SOIC package?
The junction-to-ambient thermal resistance (RθJA) for SN74CBTLV3125D in the SOIC (D) package is 123.0 °C/W, measured under standard JEDEC test conditions (1-layer board, 1 in² copper pad). This value assumes proper PCB layout with adequate copper pour and decoupling - actual thermal performance depends on board-specific heatsinking.
SN74CBTLV3125D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74CBTLV
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Bus Switch
- Circuit:
- 1 x 1:1
- Independent Circuits:
- 4
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74CBTLV3125D FAQ
1.How can I place an order for SN74CBTLV3125D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74CBTLV3125D on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74CBTLV3125D reliable?
The price and inventory of SN74CBTLV3125D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74CBTLV3125D is usually 5 days.
3.What payment methods are accepted for SN74CBTLV3125D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74CBTLV3125D transactions.
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4.How is shipping managed for SN74CBTLV3125D?
SN74CBTLV3125D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74CBTLV3125D order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74CBTLV3125D?
For technical support, including SN74CBTLV3125D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74CBTLV3125D requirements.
6.How does Aetrix verify that SN74CBTLV3125D is sourced from the original manufacturer or authorized distributors?
All SN74CBTLV3125D products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74CBTLV3125D meets industry standards.
7.What is the process for return or replacement of SN74CBTLV3125D?
All SN74CBTLV3125D units undergo pre-shipment inspection (PSI). If there is an issue with SN74CBTLV3125D, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74CBTLV3125D part is unused and in its original packaging.
Return procedure for SN74CBTLV3125D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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